ADD CONSTRAINT UC_constraint UNIQUE (ID,Name); To define a UNIQUE constraint on multiple columns: *The Unique constraint(UC) It is absolutely good practice to name your constraints. DESC constraints; ...

This project demonstrates the use of various DDL (Data Definition Language) constraints and SQL operations to manage a simple database for a sales system. Create a table named Orders with columns: ...

When I am working with an Oracle database, I still find myself using SQL*Plus for many quick and dirty database queries. In particular, I often look up constraints in SQL*Plus. In this post, I ...

In a relational DBMS, you use a high-level language to operate on the data managed by the DBMS. In many cases, that language is SQL. A DBMS enables you, or an application program such as the SAS ...

You specify DBMS SQL syntax instead of SAS SQL syntax when you use the Pass-Through Facility. You can use Pass-Through Facility statements in a PROC SQL query or store them in a PROC SQL view. The ...

These constraints can be enforced by the Database Management System automatically. Any violation from these constraints is handled by programmer's written code. This paper proposes an approach to ...